Regex: matching up to the first occurrence of a character

You need

/[^;]*/

The [^;] is a character class, it matches everything but a semicolon.

To cite the perlre manpage:

You can specify a character class, by enclosing a list of characters in [] , which will match any character from the list. If the first character after the “[” is “^”, the class matches any character not in the list.

This should work in most regex dialects.

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